Docker and Podman on Linux: Containerization Best Practices in 2026

Podman has matured into a genuinely solid daemonless, rootless alternative to Docker, and most developers now have a real choice to make. Here’s a practical comparison, plus best practices that apply no matter which one you pick.

Docker vs Podman: The Core Difference

Docker runs a privileged background daemon that owns all your containers. Podman runs containers as regular child processes with no daemon, and supports rootless containers by default — meaningfully reducing the attack surface on a shared or security-sensitive machine.

# Podman: familiar Docker-compatible CLI, no daemon required
podman run -d --name web -p 8080:80 nginx:alpine
podman ps
podman logs web

# Most Docker commands work unchanged with Podman
alias docker=podman

Rootless Containers

Running containers without root is one of Podman’s biggest security wins. It uses user namespaces to map container root to an unprivileged host user:

# Confirm you're running rootless
podman info --format '{{.Host.Security.Rootless}}'

# Rootless containers still need subuid/subgid ranges configured
grep $(whoami) /etc/subuid /etc/subgid

Writing a Solid Dockerfile (Works for Both Engines)

Regardless of which engine you use, these Dockerfile practices keep images small and builds fast:

# Use a minimal, pinned base image
FROM python:3.12-slim AS base

# Install dependencies in a separate layer so code changes don't bust the cache
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code last
COPY . .

# Run as a non-root user inside the container
RUN useradd -m appuser
USER appuser

EXPOSE 8000
CMD ["python", "-m", "uvicorn", "main:app", "--host", "0.0.0.0"]

Multi-Stage Builds for Smaller Images

FROM golang:1.23 AS builder
WORKDIR /src
COPY . .
RUN CGO_ENABLED=0 go build -o /app ./cmd/server

FROM gcr.io/distroless/static-debian12
COPY --from=builder /app /app
USER nonroot:nonroot
ENTRYPOINT ["/app"]

Compose Files Work on Both

Podman supports Compose files via podman-compose or the built-in podman compose command, so existing docker-compose.yml files generally work unmodified:

services:
  web:
    build: .
    ports:
      - "8000:8000"
    environment:
      - LOG_LEVEL=info
    depends_on:
      - db
  db:
    image: postgres:16-alpine
    environment:
      - POSTGRES_PASSWORD=devpassword
    volumes:
      - db_data:/var/lib/postgresql/data

volumes:
  db_data:

Which Should You Pick?

Podman is the better default on Linux workstations and security-sensitive servers, especially anywhere rootless matters. Docker still has the edge on Windows/macOS developer experience via Docker Desktop, and broader third-party tooling assumes the Docker daemon exists. Many teams simply run Podman in CI/production and Docker Desktop on developer laptops — the Dockerfiles are portable either way.